I can see merits in both sides of the argument, and maybe the shop was justified in charging what they did, but I think the shop made a long-term mistake in charging the full amount.

Why?

Because they probably lost a customer (you), and you'll probably tell 15 more people on how this shop over-charges.

When you say your father has known this mechanic since the 60's, do you mean that he just knows the guy as an acquaintance, or do you mean that this mechanic has been working on your cars since the 1960's?

If your father has been a customer of this guy for 40 years, you'd think he do that for you as a favor, or at minumum, a small charge.

__________________
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".